<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="./lib/vue-2.4.0.js"></script>
    <style>
        .ball {
            width: 15px;
            height: 15px;
            border-radius: 50%;
            background-color: #f00;
        }
    </style>
</head>

<body>
    <div id="app">
        <input type="button" value="加入购物车" @click="flag=!flag">
        <transition @before-enter="beforeEnter" @enter="enter" @after-enter="afterEnter">
            <div :class="{ ball: true }" v-show="flag"></div>
        </transition>
    </div>
    <script>
        // 定义两组类、使用animate.css类库都无法实现重复的半场动画  半场动画必须使用动画的钩子函数
        var vm = new Vue({
            el: '#app',
            data: {
                flag: false
            },
            methods: {
                beforeEnter(el) {
                    el.style.transform = 'translate(0, 0)';
                },
                enter(el, done) {
                    el.offsetWidth
                    el.style.transform = 'translate(150px, 450px)'
                    el.style.transition = 'all 0.8s ease'
                    done()
                },
                afterEnter(el) {
                    // this.flag = !this.flag;
                    el.style.opacity = 0.5
                }
            }
        })
    </script>
</body>

</html>